Courage is a kind of quality --- and that’s __________it takes to face the challenges in life.
As it tuned out to be a small house party, we ____ so formally.
— The woman biologist stayed in Africa studying wild animals for 13 years before she returned. — Oh, dear! She ______ a lot of difficulties!
To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.
There used to be a small school,___________?
The two strangers talked as if they ____ friends for years.A should be B would be C have been D had been